W90220F Winbond Electronics Corp America, W90220F Datasheet - Page 40

• Manufacturer Part Number: W90220F
• Description: Pa-risc Embedded Controller
• Manufacturer: Winbond Electronics Corp America

The above information is the exclusive intellectual property of Winbond Electroncs Corp. and shall not be dsiclosed or distributed or reproduced without permission from
Winbond.
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Bit 7-8 DMA IO device type(IOtype)
Bit 9-10 DMA transfer type(TRtype)
Bit 11-15
Bit 16-20
In MOD0:
Bit21
Bit22
Bit23-31 Ready timeout counter(Tout)
DMA transfer fix mode(FIX)
Reserved
This bit should be set to 0.
00 = 8-bit type, length counter(LENC) counts by byte
01 = 16-bit type, length counter counts by half word
10 = 32-bit type, length counter countes by word
11 = undefined
00 = memory to memory transfer
01 = memory to IO transfer
1x = IO to memory transfer
DMA IO read/write command recovery time(IOrec)
DMA IO read/write command wait state(Wstate)
This field define the IO read/write command wait state.
1 = Set DMA transfer as rotate mode. In rotate mode, the DMA controller acknowledge channel 1
0 = DMA is set in fix mode. Channel 0 is the most privilege. The channel 1 will not get the service
request right after channel 0 being served. The channel 1 and channel 0 are served by turns.
token, unless channel 0 release the request.
Set IO device assert NOT ready timeout cycle count. When IO read/write command is issued, and if
the IO device inserts wait state by asserting IORDY, the ready timeout counter starts to count. If the
counter reach the Tout before read/write command is completed, the timeout flag TO0 or TO1 is to
be set.
This bit is valid only in the transfer between memory and IO.
Only 8-bit external IO device is supported.
This field define the recovery cycle between two read/write command.
W90220F
Version 0.84